Method and system for processing bearer under ISR mechanism

ABSTRACT

A method and a system for processing a bearer under an idle mode signaling reduction (ISR) mechanism are provided. The method for processing a bearer under an ISR mechanism includes the following steps. A mobility management network element acquires an access mode of a current network. The mobility management network element notifies a serving gateway (SGW) of the access mode of the current network, so that the SGW processes bearer according to the access mode of the current network. It can be ensured that the access mode of the current network is consistent with the access mode for a policy and charging control (PCC) strategy adopted during a bearing procedure under the ISR mechanism.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation of U.S. patent application Ser. No.12/835,483, filed on Jul. 13, 2010, which is a continuation ofInternational application No. PCT/CN2009/070163, filed on Jan. 15, 2009.The International Application claims priority to Chinese PatentApplication No. 200810006272.7, filed on Feb. 4, 2008. Theafore-mentioned patent applications are hereby incorporated by referencein their entireties.

TECHNICAL FIELD

The present disclosure relates to the field of mobile communicationtechnology, and particularly to a method and a system for processing abearer under an idle mode signaling reduction (ISR) mechanism.

BACKGROUND

A core network of a wireless evolution network mainly includes threelogic function entities, namely, a mobility management entity (MME), aserving gateway (SGW), and a packet data network gateway (PGW). The MME,as a mobility management network element, is responsible for functionssuch as signaling encryption, roaming, tracking, assignment of temporarysubscriber identities and security functions, and the MME corresponds toa control plane part a General Packet Radio Service (GPRS) support nodeinside a current system. The SGW is responsible for local mobile anchorpoints and mobile anchor points inside a system and lawful interceptionof relevant information. The PGW is responsible for policy execution andcharging and lawful interception of relevant functions. The policyexecution and charging is on the basis of a policy and charging control(PCC) rule, which is delivered to the PGW by a policy and charging rulesfunction (PCRF) entity. As the PCRF entity delivers the PCC rule, thePCC rule needs to be determined according to a current radio access type(RAT) of a user. Different RATs may deliver different PCC rules.

Signaling reduction, also called idle mode signaling reduction, canfunction to reduce signaling over air interface only if the userequipment (UE) is in an idle mode. If an ISR mechanism is adopted for 2Gand/or 3G, the user plane in the idle mode is terminated at the SGW.Therefore, under the case that a signaling reduction mechanism isinitiated at the user and the network side, the network side cannot knowthe specific network of the user is 2/3G or a Local Term Evolution(LTE).

In the ISR mechanism, when the user in 2/3G is in IDLE mode, andhandovers from a source side 2/3G network to a target side LTE network,since the PGW knows nothing of the user state, and still holds the PCCpolicy corresponding to the access of the source side 2/3G network, andat this time, the IDLE mode user may possibly be in the LTE accessnetwork. If the PGW initiates bearer establishing/modifying/deletingprocedure, after the MME pages the user, the bearerestablishing/modifying/deleting process will be executed at the side ofthe LTE, thereby successfully establishing/modifying/deleting thebearer. However, the PCC policy on which theestablishing/modifying/deleting process of the bearer initiated by thePGW is based is directed to the access mode of 2/3G.

In the conventional art, under the ISR mechanism, when the network sideinitiates the bearer establishing/modifying/deleting process for theIDLE user, the access mode to which the PCC policy directed may possiblybe inconsistent with the access mode of the resident network of theuser.

SUMMARY

The exemplary embodiments described below provide a method and a systemfor processing a bearer under an ISR mechanism, which can ensure that anaccess mode in a bearing procedure under the ISR mechanism is consistentwith an access mode of a current network of a user.

An embodiment provides a method for processing a bearer under an ISRmechanism, which includes the following steps.

An access mode of a current network is acquired.

The access mode of the current network is notified to an SGW, so thatthe SGW performs bearer processing according to the access mode of thecurrent network.

Another embodiment provides a mobile network system, which includes amobility management network element and an SGW.

The mobility management network element is configured to acquire anaccess mode of a current network.

The SGW is configured to acquire the access mode of the current networkfrom the mobility management network element, and perform a bearingprocedure according to the access mode of the current network.

Yet another embodiment provides a mobility management network element,which includes an acquisition unit and a notification unit.

The acquisition unit is configured to acquire the access mode of thecurrent network.

The notification unit is configured to notify the SGW of the access modeof the current network acquired by the acquisition unit.

Still another embodiment provides an SGW, which includes a receivingunit and a bearer processing unit.

The receiving unit is configured to receive the access mode of thecurrent network sent by the mobility management network element.

The bearer processing unit is configured to perform bearer processingaccording to the access mode of the current network received by thereceiving unit.

Regarding the method and system for processing a bearer under an ISRmechanism provided in the embodiments, the mobility management networkelement firstly acquires the access mode of the current network andnotifies the SGW of the acquired access mode, and the SGW then performsthe bearing procedure according to the acquired access mode of thecurrent network. Therefore, the problem that the access mode to whichthe PCC policy adopted by the network side directed during a bearingprocedure is inconsistent with the access mode of the current networkcan be avoided, which is caused because the network cannot know theaccess technique of the current network.

BRIEF DESCRIPTION OF THE DRAWINGS

FIGS. 1A and 1B are a signaling flow chart of a method for processing abearer under an ISR mechanism according to a first embodiment;

FIGS. 2A and 2B are a signaling flow chart of a method for processing abearer under an ISR mechanism according to a second embodiment;

FIGS. 3A and 3B are a signaling flow chart of a method for processing abearer under an ISR mechanism according to a third embodiment;

FIG. 4 is a schematic structural view of a mobile network systemaccording to an embodiment;

FIG. 5 is a schematic structural view of a mobility management networkelement according to an embodiment; and

FIG. 6 is a schematic structural view of an SGW according to anembodiment.

DETAILED DESCRIPTION OF THE EMBODIMENTS

The exemplary embodiments described below provide a method and a systemfor processing a bearer under an ISR mechanism. In order to make thetechnical solutions clearer and more comprehensible, embodiments withreference to the accompanying drawings are described.

Referring to FIGS. 1A AND 1B, a signaling flow chart of a method forprocessing a bearer under an ISR mechanism according to a firstembodiment is shown. The bearer processing procedure may be a beareractivation or processing procedure. In this embodiment, the beareractivation procedure under an ISR mechanism is described. User equipment(UE) in an IDLE state is moved from an original resident network to acurrent network.

The process of initiating a bearer activation procedure under the ISRmechanism specifically includes the following steps.

In step 101, a PCRF delivers a PCC rule to a PGW.

The PCC rule is a PCC rule corresponding to an access mode of theoriginal resident network.

If the PCC rule is not configured by the PCRF, a Quality of Service(QoS) rule may also be configured by the PGW.

In step 102, the PGW, according to the PCC rule, sends a create bearerrequest to an SGW.

The aforementioned is the bearer activation process triggered by thePGW.

The PCRF may also directly deliver the PCC rule to the SGW to triggerthe bearer activation process, or the SGW configures the QoS rule.

In step 103, after confirming that the UEs at access modes of a sourceside and a target side are in an IDLE state, the SGW stores the createbearer request, and notifies a mobility management network element inthe current network and a mobility management network element at anothernetwork side to initiate a UE paging procedure.

The mobility management network element above may be a MobilityManagement Entity (MME) or a Service GPRS Support Node (SGSN).

In this embodiment, the SGW may notify the mobility management networkelement in the current network and the mobility management networkelement in the original resident network to initiate paging through adownlink data notification message or another new message.

In step 104, after receiving a service request from the UE, the mobilitymanagement network element in the current network acquires the accessmode of the current network, and notifies the SGW of the access mode ofthe current network.

The mobility management network element in the current network may alsoacquire the access mode of the current network by other means. Forexample, the mobility management network element in the current networksends a message of acquiring the access mode of the current network tothe current network, and the current network returns a response messagecarrying the access mode of the current network.

In Step 105, the SGW compares the acquired access mode of the currentnetwork with the recorded access mode of the original resident networkto determine whether they are the same. If yes, the process proceeds tostep 106; otherwise, the process proceeds to step 107.

The SGW stores the access mode of the original resident network therein.

In step 106, the SGW extracts the stored create bearer request andcontinue the bearer activation process.

For example, the current network and the original resident network areboth 2G/3G networks.

Since the bearer activation process is substantially the same as thebearer activation process in the prior art, it will not be described indetail here.

In step 107, the SGW returns a response message for rejecting beareractivation to the PGW.

The response message for rejecting bearer activation may carry theaccess mode of the current network.

Specifically, the SGW may carry the access mode of the current networkas a parameter in the response message for rejecting bearer activationand send it to the PGW. The response message for rejecting beareractivation may further carry a content indicating that the access modeof the current network is inconsistent with the access mode of theoriginal resident network recorded in the PGW, for example, indicatingthat the access mode stored in the PGW is inconsistent with the currentaccess mode in the value of cause.

In step 108, the SGW sends an update bearer request to the PGW, whichcarries the access mode of the current network.

For example, the current network is a 2G/3G network, and the originalresident network is an LTE network. Thus, the update bearer requestmessage sent by the SGW to the PGW carries the access mode of thecurrent 2G/3G network.

Specifically, the SGW may carry the access mode of the current networkas a parameter in the update bearer request message and send it to thePGW. The update bearer request message may further carry a contentindicating that the access mode of the current network is inconsistentwith the access mode of the original resident network recorded in thePGW, for example, indicating that the access mode stored in the PGW isinconsistent with the current access mode in the value of cause.

When the SGW is connected to multiple packet data networks (PDNs), itsends the update bearer request message to multiple PGWs.

In step 109, the PGW returns an update bearer response message to theSGW.

In step 110, the PGW sends the access mode of the current network to thePCRF, and acquires the PCC rule corresponding to the access mode of thecurrent network from the PCRF.

In step 111, the PGW initiates a bearer activation process according tothe acquired PCC rule corresponding to the access mode of the currentnetwork.

If, in steps 101-102, the PCRF directly delivers the PCC rule to the SGWto trigger the bearer activation process, the process from step 107 tostep 111 is as follows. The SGW sends the access mode of the currentnetwork to the PCRF, and the PCRF sends the PCC rule corresponding tothe access mode of the current network to the SGW and the PGW. The SGWinitiates the bearer activation process according to the PCC rulecorresponding to the access mode of the current network.

The present disclosure is applicable to not only the bearer activationprocedure in the embodiment, but also bearer modifying and deletingprocedures, which are substantially similar to the bearer activationprocedure and will not be further described here.

Referring to FIGS. 2A AND 2B, a signaling flow chart of a method forprocessing a bearer under an ISR mechanism according to a secondembodiment is shown. The bearer processing procedure may be a bearerinitiating or processing procedure. This embodiment is still describedaccording to the bearer activation procedure under the ISR mechanism. UEin an IDLE state is moved from an original resident network to a currentnetwork.

The specific signaling flow of initiating a bearer activation procedureunder the ISR mechanism includes the following steps.

In step 201, a PCRF delivers a PCC rule to a PGW.

The PCC rule is a PCC rule corresponding to an access mode of theoriginal resident network.

If the PCC rule is not configured by the PCRF, a QoS rule may also beconfigured by the PGW.

In step 202, the PGW, according to the PCC rule, sends a create bearerrequest to an SGW.

The PCRF may also directly deliver the PCC rule to the SGW to triggerthe bearer activation process, or the SGW configures the QoS rule.

In step 203, if the SGW finds that the user is in an IDLE state in twoaccess modes under the ISR mechanism, it sends a create bearer requestto a mobility management network element in the current network and amobility management network element in the original resident network.

In step 204, the mobility management network element in the currentnetwork and the mobility management network element in the originalresident network firstly store signaling and then page the user, and themobility management network element in the current network acquires theaccess mode of the UE after receiving the service request of the UE.

The mobility management network element of the current network may alsoacquire the access mode of the current network by other means, forexample, sending a message of acquiring the access mode of the currentnetwork to the current network, and the current network returns aresponse message carrying the access mode of the current network.

In step 205, the mobility management network element of the currentnetwork continues performing the bearer activation process, and sends anupdate bearer request message to the SGW. The update bearer requestmessage carries the access mode of the current network, and the SGWreturns an update bearer response message to the mobility managementnetwork element of the current network.

In step 206, the SGW notifies the mobility management network element ofthe original resident network to stop paging the user, and stopprocessing the previously received create bearer request. The SGWcompares the access mode of the current network with the access mode ofthe original resident network to determine whether they are the same. Ifthey are not the same, the process proceeds to step 207.

The SGW stores the access mode of the original resident network therein.

In step 207, the SGW sends the update bearer request message to the PGW.

The update bearer request message may carry the access mode of thecurrent network.

Specifically, the SGW may carry the access mode of the current networkas a parameter in the update bearer request message and send it to thePGW. The update bearer request message may further carry a contentindicating that the access mode of the current network is inconsistentwith the access mode of the original resident network recorded in thePGW, for example, indicating that the access mode stored in the PGW isinconsistent with the current access mode in the value of cause.

When the SGW is connected to multiple PDNs, it sends the update bearerrequest message to multiple PGWs.

In step 208, the PGW returns an update bearer response message to theSGW.

In step 209, the PGW sends the access mode of the current network to thePCRF, and acquires the PCC rule corresponding to the access mode of thecurrent network from the PCRF.

In step 210, after the bearer activation process is ended, the PGWinitiates a bearer modifying process according to the acquired PCC rulecorresponding to the access mode of the current network.

If, in steps 201-202, the PCRF directly delivers the PCC rule to the SGWto trigger the bearer activation process, the process from step 207 tostep 210 is as follows. The SGW sends the access mode of the currentnetwork to the PCRF, and the PCRF sends the PCC rule corresponding tothe access mode of the current network to the SGW and the PGW. After thebearer activation process is ended, the SGW initiates the bearermodifying process according to the PCC rule corresponding to the accessmode of the current network.

The present disclosure is applicable to not only the bearer activationprocedure in the embodiment, but also bearer modifying and deletingprocedures, which are substantially similar to the bearer activationprocedure and will not be further described here.

Referring to FIGS. 3A AND 3B, a signaling flow chart of a method forprocessing a bearer under an ISR mechanism according to a thirdembodiment is shown. The bearer processing procedure may be a bearerinitiating or processing procedure. This embodiment is still describedaccording to the bearer activation procedure under the ISR mechanism. UEin an IDLE state is moved from an original resident network to a currentnetwork.

In step 301, a PCRF delivers a PCC rule to a PGW.

The PCC rule is a PCC rule corresponding to an access mode of theoriginal resident network.

If the PCC rule is not configured by the PCRF, a QoS rule may also beconfigured by the PGW.

In step 302, the PGW sends, according to the acquired PCC rule, a createbearer request to an SGW.

Of course, the PCRF may also directly deliver the PCC rule to the SGW totrigger the bearer activation process, or the SGW configures the QoSrule.

In step 303, if the user is in an IDLE state in two access modes underthe ISR mechanism, the SGW sends a create bearer request message to amobility management network element in the current network and amobility management network element in the original resident network.

The message carries the access mode of the original resident networkrecorded in the SGW.

In step 304, the mobility management network element in the currentnetwork and the mobility management network element in the originalresident network firstly store signaling and then page the user, and theaccess mode of the current network is acquired by paging the user.

The mobility management network element of the current network may alsoacquire the access mode of the current network by other means, forexample, the mobility management network element of the current networksends a message of acquiring the access mode of the current network tothe current network, and the current network returns a response messagecarrying the information of the access mode of the current network.

In step 305, the mobility management network element of the currentnetwork compares the acquired access mode of the current network withthe access mode of the original resident network carried in the messageof the bearer request sent by the SGW to determine whether they are thesame. If yes, the process proceeds to step 306; otherwise, the processproceeds to step 307.

In step 306, the mobility management network element extracts the storedcreate bearer request and continues the bearer activation process.

Since the bearer activation process is substantially the same as thebearer activation process in the prior art, it will not be described indetail here.

In step 307, the mobility management network element of the currentnetwork returns the create bearer response message to the SGW, whichcarries the access mode of the current network.

The mobility management network element of the current network may alsosend the access mode of the current network to the SGW by the updatebearer request message.

In step 308, the SGW returns a response message for rejecting beareractivation to the PGW.

The response message for rejecting bearer activation may carry theaccess mode of the current network.

Specifically, the SGW may carry the access mode of the current networkas a parameter in the response message for rejecting bearer activationand send it to the PGW. The response message for rejecting beareractivation may further carry a content indicating that the access modeof the current network is inconsistent with the access mode of theoriginal resident network recorded in the PGW, for example, indicatingthat the access mode stored in the PGW is inconsistent with the currentaccess mode in the value of cause.

In step 309, the SGW sends an update bearer request message to the PGW,which carries the access mode of the current network.

Specifically, the SGW may carry the access mode of the current networkas a parameter in the update bearer request message and send it to thePGW. The update bearer request message may further carry a contentindicating that the access mode of the current network is inconsistentwith the access mode of the original resident network recorded in thePGW, for example, indicating that the access mode stored in the PGW isinconsistent with the current access mode in the value of cause.

When the SGW is connected to multiple PDNs, it sends the update bearerrequest message to multiple PGWs.

In step 310, the PGW returns an update bearer response message to theSGW.

In step 311, the PGW sends the access mode of the current network to thePCRF, and acquires the PCC rule corresponding to the access mode of thecurrent network from PCRF.

In step 312, the PGW initiates a bearer activation process according tothe acquired PCC rule corresponding to the access mode of the currentnetwork.

If, in steps 301-302, the PCRF directly delivers the PCC rule to the SGWto trigger the bearer activation process, the process from step 308 tostep 312 is as follows. The SGW sends the access mode of the currentnetwork to the PCRF, and the PCRF sends the PCC rule corresponding tothe access mode of the current network to the SGW and the PGW. The SGWinitiates the bearer activation process according to the acquired PCCrule corresponding to the access mode of the current network.

The present disclosure is applicable to not only the bearer activationprocedure in the embodiment, but also bearer modifying and deletingprocedures, which are substantially similar to the bearer activationprocedure and will not be further described here.

Referring to FIG. 4, a schematic structural view of an embodiment of amobile network system is shown.

The mobile network system includes a mobility management network element41, an SGW 42, a PGW 43, a PCRF entity 44.

The mobility management network element 41 is configured to acquire anaccess mode of a current network, which may be an MME or an SGSN.

The SGW 42 is configured to acquire the access mode of the currentnetwork from the mobility management network element 41, and perform abearing process according to the access mode of the current network.

The PCRF entity 44 is configured to receive the access mode of thecurrent network sent by the SGW 42 and provide a PCC rule correspondingto the access mode of the current network for the SGW 42 or the PGW 43.

The PGW 43 is configured to send the access mode of the current networkacquired by the SGW 42 to the PCRF entity 44, and initiate a bearingprocess according to the PCC rule corresponding to the access mode ofthe current network provided by the PCRF entity 44.

Referring to FIG. 5, a schematic structural view of an embodiment of amobility management network element is shown.

The mobility management network element includes an acquisition unit 51,a notification unit 52, and a comparison unit 53.

The acquisition unit 51 is configured to acquire the access mode of thecurrent network.

The notification unit 52 is configured to notify the SGW of the accessmode of the current network acquired by the acquisition unit 51.

The acquisition unit 51 includes a receiving unit 511 and a paging unit512.

The receiving unit 511 is configured to receive a bearer requestinitiated by the SGW or receive a notification message of paging a userinitiated by the SGW.

The paging unit 512 is configured to initiate a user paging according tothe bearer request or the notification message of paging a user receivedby the receiving unit 511, and acquire the access mode of the currentnetwork through the user paging.

The comparison unit 53 is configured to compare the access mode of thecurrent network with the access mode of the original resident network.When the comparison result indicates that the access mode of the currentnetwork is different from the access mode of the original residentnetwork, the notification unit 52 notifies the SGW of the access mode ofthe current network.

The mobility management network element further includes a storage unit.

The storage unit is configured to store the bearer request received bythe receiving unit.

Referring to FIG. 6, a schematic structural view of an embodiment of anSGW is shown.

The SGW includes a receiving unit 61, a bearer processing unit 62, arecording unit 63, and a comparison unit 64.

The receiving unit 61 is configured to receive the access mode of thecurrent network sent by the mobility management network element.

The bearer processing unit 62 is configured to perform bearer processingaccording to the access mode of the current network received by thereceiving unit 61.

The recording unit 63 is configured to record the access mode of theoriginal resident network.

The comparison unit 64 is configured to compare the access mode of thecurrent network received by the receiving unit 61 with the access modeof the original resident network recorded by the recording unit 63. Whenthe comparison result indicates that the access mode of the currentnetwork is different from the access mode of the original residentnetwork, the bearer processing unit 62 performs bearer processingaccording to the access mode of the current network received by thereceiving unit 61.

The SGW can further include a bearer request receiving unit and asending unit.

The bearer request receiving unit is configured to receive the bearerquest sent by the PGW.

The sending unit is configured to notify the mobility management networkelement to page a user.

The SGW may further include a notification unit.

The notification unit is configured to notify the PGW of the access modeof the current network received by the receiving unit.

Through the method for processing a bearer under an ISR mechanism, themobile network system, the mobility management network element, the SGWprovided in the embodiments, the mobility management network elementfirstly acquires the access mode of the current network and notifies theSGW of the acquired access mode, and the SGW then performs the bearingprocedure according to the acquired access mode of the current network.Therefore, the problem that the access mode to which the PCC policyadopted by the network side directed during a bearing procedure isinconsistent with the access mode of the current network can be avoided,which is caused because the network cannot know the access technique ofthe current network.

The method for processing a bearer under an ISR mechanism is introducedabove in detail. It is understood that persons of ordinary skill maymake variations to the described embodiments with departing from thescope of the claims. Moreover, it is understood that the scope of theclaims is not limited to any particular embodiment, described above.

1. A method for processing a bearing procedure, comprising: receiving,by a serving gateway (SGW), a first bearer request sent by a packet datanetwork gateway (PGW); notifying, by the SGW, a mobility managementnetwork element (MME) to page a user; receiving, by the SGW, an accessmode of a current network sent by the MME; comparing, by the SGW, theaccess mode of the current network with a recorded access mode of anoriginal resident network; notifying, by the SGW, the PGW of the accessmode of the current network when a comparison result indicates that theaccess mode of the current network is different from the access mode ofthe original resident network; receiving, by the SGW, a second bearerrequest corresponding to the access mode of the current network sent bythe PGW according to a policy and charging control (PCC) rulecorresponding to the access mode of the current network; and performingthe second bearer request corresponding to the access mode of thecurrent network; wherein the method is performed under an idle modesignaling reduction (ISR) mechanism, and wherein the first bearerrequest is sent by the PGW in accordance with a PCC rule sent by apolicy and charging rules function (PCRF) entity corresponding to theaccess mode of the original resident network.
 2. The method according toclaim 1, wherein before the receiving the first bearer request sent bythe PGW, the method further comprises: receiving, by the PGW, a PCC rulecorresponding to the access mode of the original resident network sentby a policy and charging rules function (PCRF) entity; and sending, bythe PGW, the first bearer request according to the PCC rulecorresponding to the access mode of the original resident network to theSGW.
 3. The method according to claim 1, wherein when receiving thefirst bearer request sent by the PGW, the method further comprises:storing, by the SGW, the first bearer request after confirming that theUE is in an IDLE state.
 4. The method according to claim 1, whereinafter the notifying the PGW of the access mode of the current network,the method further comprises: sending, by the PGW, the access mode ofthe current network to the PCRF entity, and acquiring the PCC rulecorresponding to the access mode of the current network from the PCRFentity; and sending, by the PGW, the second bearer request correspondingto the access mode of the current network according to the acquired PCCrule to the SGW.
 5. A system for processing a bearing procedure,comprising: a mobility management network element (MME) hardware device,configured to acquire an access mode of a current network; a hardwareserving gateway (SGW) device, configured to receive a first bearerrequest from a hardware packet data network gateway (PGW) device, notifythe MME device to page a user, acquire the access mode of the currentnetwork from the MME device, compare the access mode of the currentnetwork with a recorded access mode of an original resident network,notify the PGW device of the access mode of the current network when acomparison result indicates that the access mode of the current networkis different from the access mode of the original resident network,receive a second bearer request corresponding to the access mode of thecurrent network sent by the PGW device according to a policy andcharging control (PCC) rule corresponding to the access mode of thecurrent network, and perform the second bearer request corresponding tothe access mode of the current network; and the PGW device, configuredto send the first bearer request to the SGW device, receive the notifyof the access mode of the current network from the SGW device, and sendthe second bearer request corresponding to the access mode of thecurrent network to the SGW device; wherein the system is configured tooperate under an idle mode signaling reduction (ISR) mechanism andwherein the first bearer request is sent by the PGW in accordance with aPCC rule sent by a policy and charging rules function (PCRF) entitycorresponding to the access mode of the original resident network. 6.The system according to claim 5, further comprising a policy andcharging rules function (PCRF) entity, wherein: the PGW device, furtherconfigured to send the access mode of the current network acquired bythe SGW device to the PCRF entity, acquire the PCC rule corresponding tothe access mode of the current network from the PCRF entity, wherein thePGW device sends the second bearer request corresponding to the accessmode of the current network according to the acquired PCC rule to theSGW device; and the PCRF entity, configured to receive the access modeof the current network sent by the PGW device, and provide the PCC rulecorresponding to the access mode of the current network to the PGWdevice.
 7. A serving gateway (SGW) hardware device for processing abearing procedure, comprising: a bearer request receiving unit,configured to receive a first bearer request sent by a hardware packetdata network gateway (PGW) device; a sending unit, configured to notifya mobility management network element hardware device to page a user; areceiving unit, configured to receive an access mode of a currentnetwork sent by the mobility management network element hardware device;a comparing unit, configured to compare the access mode of the currentnetwork with a recorded access mode of an original resident network; anotification unit, configured to notify the PGW device of the accessmode of the current network received by the receiving unit when acomparison result indicates that the access mode of the current networkis different from the access mode of the original resident network; thebearer request receiving unit, further configured to receive a secondbearer request corresponding to the access mode of the current networksent by the PGW device according to a policy and charging control (PCC)rule corresponding to the access mode of the current network; and abearer processing unit, configured to perform the second bearer requestcorresponding to the access mode of the current network received by thebearer request receiving unit; wherein the SGW device is configured tooperate under an idle mode signaling reduction (ISR) mechanism andwherein the first bearer request is sent by the PGW in accordance with aPCC rule sent by a policy and charging rules function (PCRF) entitycorresponding to the access mode of the original resident network. 8.The SGW according to claim 7, further comprising: a recording unit,configured to record the access mode of the original resident network.